Gerald A. Miller
A historical review of pion-nucleon interactions at low energy is presented, with aims toward a pedagogic approach focusing on issues germane to current research. These topics include the use of chiral effective field theory, the sigma term, qualitative understanding of low-energy phase shifts, the physics of the Δ resonance, and isospin violation. A theme is that low-energy pion-nucleon scattering is directly related to QCD via effective field theory.
Comments: 15 pages, 7 figures, prepared as a chapter of the book "75 Years of Pion" edited by Igor Strakovsky, Alexey Petrov, and Nicolai Popov. arXiv admin note: text overlap with arXiv:2205.01108, arXiv:0907.4569, arXiv:2111.09849 by other authors